Given below are the successive ionization energies, in KJmol⁻¹ of Calcium, magnesium, rubidium and strontium (not in order).
Which is the series for calcium?
550, 1050, 4200, 5500
400, 2700, 3800, 5100
740, 1500, 7700, 10500
590, 1100, 4900, 6500
The first five ionization energies, in kJ mol⁻¹, of aluminium are 578, 1817, 2745, 11578, 14831.
The orbitals from which the first five electrons are removed during ionization, starting with the first electron, are:
3p 3s 2p 2s 1s
3p 3s 3s 2p 2p
1s 1s 2s 2s 2p
1s 2s 2p 3s 3p
X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below.
The average atomic mass of the element is amu.
i. Isotope -- % -- Mass
ii. 40X -- 13.01 -- 40.10
iii. 41X -- 6.98 -- 41.00
iv. 44X -- 79.99 -- 43.98
38.64
39.68
39.07
43.26
